Effect of Micromorphology on Alkaline Polymer Electrolyte Stability

Juanjuan Han, Jing Pan, Chen Chen, Ling Wei, Yu Wang, Qiyun Pan, Nian Zhao, Bo Xie, Li Xiao, Juntao Lu, Lin Zhuang

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Abstract

Recent studies demonstrated that the chemical stability of alkaline polymer electrolytes (APEs) could be improved by reducing the inductive effect between cations and backbones. Therefore, pendent cations were recommended. However, microphase-separated morphologies would be generated by elongating the spacer between cations and backbones, which have a significant influence on the chemical stability of APEs too. In order to analyze how the patterns of micromorphology affect the chemical stability of the materials, in the present work, four APEs (a 1 -QAPS, a 3 -QAPS, a 5 -QAPS, and a 7 -QAPS) with different lengths of side chain between polysulfone and quaternary ammonium are synthesized. The longer the side chain is, the more obvious the microphase separation for the a x -QAPS membranes is observed. After immersing in a hot alkaline solution (80 °C, 1 M KOH) for 30 days, a 5 -QAPS exhibits the highest chemical stability. The ion exchange capacity and ionic conductivity of a 5 -QAPS film are reduced by 10.0 and 10.5%, respectively. The weight loss of a 5 -QAPS membrane is 8.0%, which is similar to the value of the pristine backbone. The increased chemical stability can be ascribed to the suitable micromorphology constructed in a 5 -QAPS sample. Besides, a 5 -QAPS membrane shows a high conductivity of 75.5 mS cm -1 , whereas the swelling ratio is limited to 15.0% in liquid water at 80 °C. In addition, a peak power density of 339.1 mW cm -2 is obtained by applying a 5 -QAPS as the APE to the H 2 -O 2 fuel cell at 60 °C.

Original languageEnglish (US)
Pages (from-to)469-477
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number1
DOIs
StatePublished - Jan 9 2019

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Han, J., Pan, J., Chen, C., Wei, L., Wang, Y., Pan, Q., Zhao, N., Xie, B., Xiao, L., Lu, J., & Zhuang, L. (2019). Effect of Micromorphology on Alkaline Polymer Electrolyte Stability. ACS Applied Materials and Interfaces, 11(1), 469-477. https://doi.org/10.1021/acsami.8b09481